Final answer:
The Blue Cross Blue Shield Association offers private insurance plans and is a federation of nonprofit organizations.
Step-by-step explanation:
The federation of nonprofit organizations offering private insurance plans is A. Blue Cross Blue Shield Association. This organization provides various health insurance products to individuals and families. In contrast, Medicare, TRICARE, DEERS, and CHAMPVA are not federations of nonprofit organizations—Medicare is a public healthcare system that offers insurance primarily to people over sixty-five years old, TRICARE is a healthcare program for military personnel and their families, DEERS is a database for military members to keep their health benefits in order, and CHAMPVA provides health benefits to disabled veterans and their families.